Grinding machine



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To all whom it may concer/a."

Be it lmown that l, deserti ill. lPnunAonr, acitizen oi* the lUnitedhtates, and a resident ci Watertown, in thecounty oir Middlesex tl andState or Massachusetts, have invented certain new and usefulimprovements in Grinding ll/lachines, oil which the iollowing is aspecicatio-n.,

ll/ly present invention relates toimprovelll ments in the art olgrinding the edges or sides 'oit' rectangular objects, such, forenample, as the hard rubber covers oi battery bones 'or cells, and,though not limited to this speciiic use, is, lor convenience, illusllitrated and described herein in this connection.

ll`he invention aims to provide apparatus by which such articles mayexpeditiously, accurately, and economically be ground or trued with a-minimum amount ol manual worlr or attention.

With such and other objects in view, the invention includes the novelfeatures oil construction and arrangement and combination ci" partshereinatter described, the nature and scope ol said invention bein denedby the claims appended to the 'lo lowing descri tion.

il hat il regard at present as the preferred l@ embodiment et myinvention is illustrated in the accompanying drawings, in which :dllligure l is a plan view oit apparatus de signed lor grinding the edgesol hard ruhn her battery lloon covers;

titi hig., l is a section on line ae-a olf llig., l;

Fig.. il is a section on line li-h ol Fig.. l;

liig.. d is a iront view;

Fig.. d is an end view;

lliig t is a section on line ol l;

5 is a section on line 5-5 oil' l, and lfigsn ti to lll are detailviews. ldelerring by reterence characters to these drawings, in whichsimilar letters or numbers indicate the same parts wherever used, thenumerals l and il designate the primary and secondary coveying ortransporting elements whichv are shown as in the term oit endless chainsor conveyors, the chain l conlill veying the covers trom a leed stationin a rectilinear path between a pair ol primary grinding discs ordevices, by which two el the edges are accurately ground in parallelism,and the chain 2 conveying them in a rectilinear path at right angles tothe tirst named path and between a pair oi secondary grinding discs ordevices by which the renoaining two edges are similarly ground ortrimmed. The covers are designated by the numerals 3, 8, etc., and theymay be supplied to the machine in any suitable manner, conveniently byplacing them successively by hand in inverted positionl on a supportingplate or table el (litiga il@ and lb) and the tlange 3a at one sideedge-being inserted in the guide slot or space 5a between the lower andupper guide raids 5 and l, which guide rails entend past the primarygrinding discs as hereinailter described., Upposed to guide rails orbars i and l, or upon the opposite side ot the primary conveyor chain i,is a second pair ol guide rails or hars o and d,

spaced apart to provide an intervening guide slot o@ to admit theopposite edge flange ot? the cover, it being observed that the guiderails or hars ti and begin at the delivery end oi the table or plate t,so that the cover may he placed upon the table *trom position li in Fig.l, and shoved laterally in the direction oil the horizontal arrow, llig.l, until. its advanced edge dan e engages guide slot 5a, and then movedongitudinal y to cause the body ol the cover to pass between the twopairs oi guide hars and the other edge tlange to enter guide slot di,such latter movement being indicated by the vertical arrow, lli l, ltwill also be understood that the e ge portions 3 or tlanges projectthrough the guide slots sudiciently ilarto enable the grinding discs toact on and shape the projecting edges., laeh successive cover may heshoved along between the guide rails, resting upon the lower rails, andretained against displacement by the u per rails, until it reaches thestation ld (Fig, l) where it is 'in position. to be automatically movedlorward by the primary or crossconveyor chain l., 7llhis chain isprovided with a plurality oil rangers 9, at suitably spaced intervals,designedto engage or abut against the rear edges or ends oi thesuccessive covers and push them iforward between and past the grindingdiscs l0 and il., the opposed grinding 'ia/ces oil which act onthe sideedgesL iid titi

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llltl of the cover and reduce them to the required dimensions.

Continuing past the grinding discs 10 and 11, the covers successivelyreach the station C where they are engaged by the suitably spaced guidedpushers 12 of the longitudinal or secondary chain or conveyor 2 andmoved at right angles to the former direction, and between. and past thegrinding discs 13 and 14 whereby the remainin two (end) edges arelproperly reduced in dimensions, or ground. Thereafter the covers areconveyed to the delivery end of the machine (station D) where they maybe deposited upon a chute 15 or its equivalent to be delivered into acontainer (not shown).

While under control of its pusher l2, the cover rests on the upper edgesof the lower guide rails or bars 16 and 17 and is held thereon by theoverlying rails or bars 18 and 19.

As these battery covers are of an elongated nature and are movedbroadwise by the secondary conveyor, it is desirable that means beprovided to prevent any tipping of the covers, and insure their beingmoved in a true right angular line. To this end the pushers 12 areprovided with spaced usher fingers 12El Fig. 8 which engage the si eedge of the cover at relatively widely separated points (on oppositesides of the center line) and said pushers are further provided withguide grooves 12b which engage the guide bars 20 and 21, the front endsof which guide bars are of wedge shape, as indicated at 20, Fig. 4 to-facilitate .entrance into the grooves.

To enable the apparatus to accommodate or operate upon different sizedcovers, one grinder disc and corres nding set of guide rails is madeadjustab e towards and from the other. l

Taking grinder disc 11 and guide rails 6-8 as an example, a bracket 22is fixed to the bed frame 63 of the machine (which may be supported bylegs or standards 64) in which bracket is rotatably mounted one end of afeed screw 23, the other end of which engages a nut 24a of head 24:.

This head is slidably supported upon the bed frame and has bearings 24hin which the shaft of the grinding disc 11 is journaled.

Bracket arms 29 connected to the head 24 support the guide rails or bars6-8, so

A that on rotating the screw in the proper direction by means of handle25, the grinding disc 11 and rails 6-8 will be moved towards and fromthe disc 10 and rails 5 7.

. These latter rails are supported by similar arms 29a which however arenot adjustable.

In connection with the adjustment of head 24, I find it desirable to usegauge means for accurac which may take the form of a bar as 26 ig. 1having holes in its ends designed to fit over pins carried by bracket 22and head 24: respectively, a number of such gauge bars being providedcorresponding to the sizes of box covers, only one, however, being shownin the drawings. Preferably the nut 24 would be made adjustable tocompensate for wear.

To compensate for variations in shape of covers, both sets of guiderails (i. e., cro and longitudinal) are preferably provided with meansfor micrometer adjustment relative to the heads. Such means may take theform of graduated cylindrical nut members 31 Fig. 13 rotatably connectedto the arms 29 and engaging screws 30 ixedly secured to the respectiverails, the cylindrical nut'members being provided with micrometerindications, as shown.

Preferably each member 31 is secured to its arm 29 by means of a bolt 32which, after adjustment, may be tightened to hold member 31 againstturning.

It will be understood that in the embodi ment shown in the lower orsupporting rails of t-he pairs of guide rails are connected with thearms 29, while the upper or hold down rails are supported from the lowerrails by braces or clips 8".

A change in width of the edges of covers operated on, would, in theabsence of compensating means, cause a change in the position of thecover when released from the primary conveyor. To obviate this andinsure the covers being released in exact alignment with the secondaryguides, l mount the idle gear 33, over which primary conveyor chain 1passes adjacent station C, adjustably, conveniently by journaling itupon the end of an arm 34 fulcrumed at 34a and provided with operatingscrews 35 and 36 (Fig. 14:) by which it may be adjusted to, and lockedin, any desired position.

'Conveyor chain. 1 also passes around idle sprocket 37 adjacent stationB, and also around drive sprocket 511- fast on operating shaft 51 whichmay be driven in any convenient manner, as for example/by belt pulley 49controlled by clutch 52.

The secondary or longitudinal conveyor chain passes around drivingsprocket 58 and idle sprocket 58a, the former being carried by a shaft61 carrying a sprocket 60 driven by chain 62 from sprocket 56 fast onshaft 59, Fig. 4, which is driven by bevel gearing 55 from shaft 51,(see dotted lines Fig. 1). It will be understood that the drivingconnections thus described are what l consider at present the preferredform. but might be changed in various ways without departing from thespirit of my invention.

Preferably idle pulley37 is mounted on an adjustable carrier to enablethe taking up of slack in the chain, as for example an eccentric shaft.

It will also be understood that the grinding discs may be driven in anydesired manamarre l i ner 'trom any suitalole source ot povver, and lhave shovvn hand pulleys as a convenient eans, as indicated 'lor exampleat llt..

lllliile passing into position U, or into alignment with thelongitudinal or secondary guides, the covers necessarily pass a gap orcutaway portion ot the transverse rails, which must ot course terminateshort ol the path ot the secondary conveyor, so as not to obstruct thesame. "llo support the cover at this point, l provide a plate or talolomernher 38, removable and replaceable hy plates oit diderent thiclrne tosuit variations in thickness ot covers operated on., .as suoli a supportvvould not necessarily provent the tilting ot a cover, duo to itspeculiar shape, -l provide additional holding means in the shape ot `acontrollinger 39, (seo lTig. ti). During thetime the cover is crossingthe gap, the control finger, which is lnlcrumed at 39", occupies theposition slioivn in dotted lines in lig. o.

'llie tinger is provided at its tree end vvitli a groove d0 (llig. 9)into which the advanced edge ol the cover enters and lay which it issupported against tilting. 'lhe tinger is also provided with a lug orextension dl adapted to he struclr hy the portion l2 ot the ided pushersot the secondary chain 2, vvhicgliJl pushes the tinger tree trom thecover against the tension ot spring a2 as the cover moves onto and alongthe longitudinal or secondary guide rails 'itt-l?.

ln this transfer position C the cover is momentarily tree trom loothconveyors and should he held securely in correct position. rl"o this ondl provide a spring pressed hall retainer d3 lFig. l2 vvhich yields topermit dil dll'

the ready passage ot the edge ot the cover, hut vvliich springs outhehind the rear corner and prevents any retrograde movement or relooundattor the cover has heen released l'rom the propelling finger orprojection ot chain l.

lWhile l have shovvn endless chains as the means lor moving the coverspast the inding or shaping devices, it vvill loe understood that l donot limit myselt to suoli specihc means, though such l regard aspro'lerahlo,

as the conveyors can thereloy he driven in alosolute uniformity.

l-laving thus descrihed my invention, tvliat l claim is l. ln a machinelor shaping the edges ol hattery hor covers and similar articles havingdanged edges., .two sots oi upper and lower guide railsl havingintervening guido spaces through which the said hanged edges project,shapingl devices mounted outside said guide rails and arranged to shapesaid projecting edges, and means for moving said articles along saidguide rails. l

a. ln a machine lor shaping the edges ot articles having marginalHongos, a pair ot supporting rails, mea tor conveyin the articles alongsaid rails with their edges projecting over the same, and trimmingdevices arranged outside said rails and adapted to act on the projectingportions ot said danges. 3. ln a machine tor shaping the edges otarticles having marginal flanges, a pair ot supporting rails adapted tosupport said marginal Hanges, hold down rails ahove the same andsupported therefrom, means tor adjusting one ol said supporting railstowards and trom the other, means tor moving the articles along saidrails, and means l'or shaping the edges during such movement.

` 4t. ln a machine tor shaping the edges ot articles having marginalHangesa pair ot supporting rails, hold down rails supported thereahoveforming intervening tlange guides, trimming devices located adjacentsaid guides, pusher means for moving the articles on the guides, one setot said rails terminating at its initial end short oit the remainingrails.

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5. ln a machine tor shaping the edges ol" articles having marginalanges, a pair o supporting rails, hold down rails supported thereahoveforming intervening Harige guides, trimming devices Ylocated adjacentsaid guides,pusher means for moving the articles on the guides, one setot rails torminating at its initial end short ot the romaining rails..and an article support assofall ciated vvith the projected portions otthe r supporting rails. i

o. lnamachine oit the character described, a pair ot primary guides,means tor convey ing the articles along said guides, shaping meansadapted to act on tvvo opposed edges vvhile so moved, a second sot otguides arranged at right angles to said tirst named guides and toreceive the articles theretrorn, shaping devices tor the remaining twoop posed edges associated .with said guides, means tor moving thearticles along said second set ol guides, and a yielding retaining dogat the terminationot the primary guides to prevent reloound ot thearticle..

7. ln a machine oil the character descriloed, a pair ol primary guides,moans tor oonveying the articles along said guides, shaping meansadapted to act on tvvo opposed edges vvhile so moved, a second set oilguides arranged at right angles to said first named 'guides Aand toreceive the articles therefrom,

sliapingdevices l'or the remaining tvvo opposed edges associated vvth,said guides, means ttor moving the articles along said second set otguides, and means lor supporting the article during its transiter tronione set ot guides to the other` taining device tor engaging the edge otthe article to prevent tipping vvhile resting on said supporting means.

ln testimony vvliereotl atiir my siature.

' JUEPl-l EPERRAT;

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